The purpose of the study is to utilize radiomic images to precisely locate areas of tumor that can be treated with dose escalation radiation therapy.

Inclusion Criteria:

• Provision of signed and dated informed consent form
• Stated willingness to comply with all study procedures and availability for the duration of the study
• For women of childbearing potential: use of highly effective contraception for at least 1 month prior to screening and agreement to use such a method during study participation and for an additional 52 weeks after the end of radiation.
• For males of reproductive potential: use of condoms or other methods to ensure effective contraception with partner 52 weeks after radiation.
• Agreement to adhere to Lifestyle Considerations (as outlined in protocol) throughout study duration.
• Pathologically (histologically or cytologically) proven diagnosis of high-grade (grade 2 or 3) Soft Tissue Sarcoma (STS) of the deep trunk and/or extremity. Clinical evidence should be documented, and may consist of pathology or imaging, and should be sufficient to estimate the size of the primary (for T stage)
• Primary site deemed resectable prior to the start of trial
• American Joint Committee on Cancer (AJCC) 8th edition staging T1-4 N0 M0, no evidence of distant metastases
• Patients must have clinically or radiographically evident measurable disease at the primary site.
• Pre-Radiation Therapy (RT) MRI within 4 weeks of the start of RT.
• Eastern Cooperative Oncology Group (ECOG) Performance Status 0 to 3.
• Deemed a surgical candidate
• Participant agrees to blood and plasma preservation for future analysis.

Exclusion Criteria:

• Contraindications to an MRI
• Positive urine pregnancy test
• Gross total excision of primary STS, including an unplanned excision
• Superficial sarcoma located primarily in the subcutaneous or cutaneous tissue
• Prior radiation to the region of the study cancer that would result in overlap of radiation therapy fields.
• Participants with a medical condition or social situation that, at the discretion of the principal investigator, would preclude them from completion of the trial.